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Finding the Fourth Proportional to 56.92, 78.72 and 47.86

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Solution

The fourth proportional to 56.92, 78.72 and 47.86 is: 66.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.92 : 78.72 = 47.86 : x
  2. Step 2: Convert to fraction form
    56.92/78.72 = 47.86/x
  3. Step 3: Cross multiply
    56.92x = 78.72 × 47.86
  4. Step 4: Simplify right side
    56.92x = 3,767.54
  5. Step 5: Solve for x
    x = 3,767.54/56.92
  6. Step 6: Final answer
    x = 66.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.